CN107940037B - The control method of test device for air tightness and this test device for air tightness - Google Patents
The control method of test device for air tightness and this test device for air tightness Download PDFInfo
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- CN107940037B CN107940037B CN201711137580.9A CN201711137580A CN107940037B CN 107940037 B CN107940037 B CN 107940037B CN 201711137580 A CN201711137580 A CN 201711137580A CN 107940037 B CN107940037 B CN 107940037B
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- valve body
- medium access
- valve
- medium
- air tightness
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/10—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit
- F16K11/20—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit operated by separate actuating members
- F16K11/22—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit operated by separate actuating members with an actuating member for each valve, e.g. interconnected to form multiple-way valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/10—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit
- F16K11/20—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit operated by separate actuating members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/0263—Construction of housing; Use of materials therefor of lift valves multiple way valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/029—Electromagnetically actuated valves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2876—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for valves
Abstract
A kind of zero-leakage stop valve includes the first valve body, the second valve body and third valve body.First medium access, second medium access and spool are equipped in first valve body, the second valve body and third valve body, spool is for being connected to or disconnecting first medium access and second medium access.The second medium access of first valve body is connected to the second medium access of the second valve body, and the second medium access of the second medium access of the first valve body, the second valve body is connected to the first medium access of third valve body.Under use state, the movement of the first valve body and the second valve body is identical, and opposite with the movement of third valve body.The invention further relates to the control method of this zero-leakage stop valve and test device for air tightness.Zero leakage seals when the shut-off valve can be realized cutting, can use big orifice aeration aperture, both ensure that the accuracy of air tightness test, also solves the problem that big flow is inflated, improves air tightness test efficiency.
Description
Technical field
The present invention relates to valve technology fields, in particular to a kind of test device for air tightness and this air tightness test
The control method of device.
Background technique
With the development of science and technology, people are higher and higher for the air-tightness requirement of portioned product, such as the electricity of water proof and dust proof
Sub- product, air tightness test are the important means for guaranteeing product quality and safe water proof and dust proof performance.Currently, in air tightness test
In, rear pressure maintaining usually is inflated to equipment and carries out air tightness test.In this process generally by inflation shut-off valve conducting
When be inflated, the inflation shut-off valve is cut off after inflation come realize pressure maintaining test.In pressure maintaining test, inflation shut-off valve must
There need to be good air-tightness, the minute leakage for inflating shut-off valve all can cause extreme influence to measuring accuracy.Inflation is cut simultaneously
Only valve must have certain effective inflation sectional area and flow in inflation, to shorten inflationtime, improve volumetric efficiency.At present
Inflation shut-off valve mainly uses common two-way electromagnetic valve, various way solenoid valve or small-bore low-flow electromagnetic valve.
The study found that in the prior art, when cutting solenoid valve carries out pressure maintaining after common two-way electromagnetic valve inflation, in solenoid valve
Outlet side (pressure maintaining end) can have the spool that certain pressure opens solenoid valve, it is difficult to accomplish completely cutting through for gas passage,
Inlet end and outlet side are there are certain gas-blowing phenomenon, and the blowing pressure is higher, inflation aperture is bigger, open the power of valve core of the electromagnetic valve
Bigger, the gas blowby of solenoid valve and leakage rate are bigger when cut-off, affect test lead and normal end the variation of true pressure difference and
The test of actual leakage amount.Various way solenoid valve uses axially movable ring type seal, axially movable because of sealing ring, cuts
Gas circuit after only equally exists certain gas blowby and leakage phenomenon, also will affect test lead and normal end the variation of true pressure difference and
The test of actual leakage amount.And as small-bore low-flow electromagnetic valve with common two-way electromagnetic valve working principle with sealing principle is
, there is also a pressure to open valve core of the electromagnetic valve at pressure maintaining end after inflation, by reducing the effective sectional area of aeration aperture, from
And aeration aperture is reduced to the active force that opens of spool, increase the air-tightness of solenoid valve, reduces gas blowby leakage rate.Therefore existing small
The inflation aperture of aperture low-flow electromagnetic valve is minimum (general aeration aperture diameter is all within 1mm), considerably increases inflationtime,
It is especially very low to the testing efficiency of big volume workpiece.
Summary of the invention
The present invention provides a kind of zero-leakage stop valves, it is intended to which the gas blowby and leakage problem for improving shut-off valve also solve the problem that
Big flow inflation, shortens inflationtime, improves air tightness test efficiency.
The present invention also provides a kind of test device for air tightness, it is intended to improve the not accurate enough problem of air tightness test.
The present invention also provides a kind of control methods of test device for air tightness, it is intended to change the gas blowby of test device for air tightness
And leakage problem, it also solves the problem that big flow is inflated, shortens inflationtime, improve air tightness test efficiency.
The present invention is implemented as follows:
A kind of zero-leakage stop valve, including the first valve body, the second valve body and third valve body；
First medium access, second medium access and spool are equipped in first valve body, the second valve body and third valve body,
Spool is disconnected for being connected to or disconnecting first medium access and second medium access, first medium access and second medium access
When, the medium of first medium access presses so that spool is closed to spool；
The second medium access of first valve body is connected to the second medium access of the second valve body, and the second of the first valve body is situated between
Matter access, the second valve body second medium access be connected to the first medium access of third valve body；
Under use state, the movement of the first valve body and the second valve body is identical, and opposite with the movement of third valve body.
Further, in preferred embodiments of the present invention, the first valve body, the second valve body and third valve body are split type knot
Structure, assembling form zero-leakage stop valve.
Further, in preferred embodiments of the present invention, the first valve body, the second valve body and third valve body are integrally formed.
Further, in preferred embodiments of the present invention, first medium access and second medium access are connected by valve port
Logical, valve core movement makes spool fully open or close valve port.
Further, in preferred embodiments of the present invention, spool includes electromagnetic control assembly, sealing element and elasticity member
Part, elastic element between sealing element and electromagnetic control assembly, back and forth transported with band dynamic seal by electromagnetic control assembly power on/off
It is dynamic, realize first medium access and second medium access be connected to or disconnection.
Further, in preferred embodiments of the present invention, the first valve body, the second valve body and third valve body are closed type
Solenoid valve.
Further, in preferred embodiments of the present invention, sealing element includes the biggish forced section of an area, and vertical
In forced section and to electromagnetic control assembly direction extend extension.
Further, in preferred embodiments of the present invention, the first valve body and the second valve body are arranged in the same horizontal line,
Third valve body and the setting of the first valve body are on the same axis.
A kind of test device for air tightness, including gas source and above-mentioned zero-leakage stop valve, the first medium of the first valve body is logical
Road is connected to gas source, and the first medium access of the second valve body is connected to the external equipment of air-tightness to be detected, and the of third valve body
Second medium access is connected to external atmosphere pressure.
A kind of control method of test device for air tightness, uses above-mentioned test device for air tightness, comprising the following steps:
S1 opens simultaneously the first valve body and the second valve body, and closes third valve body, first medium of the medium from the first valve body
Access flows into, and flows out in external equipment from the first medium access of the second valve body；
S2 simultaneously closes off the first valve body and the second valve body, and open third after external equipment is filled with a certain amount of medium
The medium between first valve body and second valve body is discharged in valve body.
The beneficial effects of the present invention are:
The zero-leakage stop valve that the present invention obtains by above-mentioned design, in use, using double acting work, the first valve body and second
Valve body simultaneously operation, opens medium channel, and close third valve body, medium enters cut-off from the first medium access of the first valve body
Then valve enters in external equipment from the first medium access of the second valve body, realize gas replenishment process.After inflation, cutting
First valve body and the second valve body carry out pressure maintaining, open simultaneously third valve body, the second medium access of the first valve body and the second valve body
In medium be discharged by third valve body.At this point, the first valve body and the second valve body only by first medium access to valve to
Lower pressure, and dwell pressure is bigger, downward pressure is also bigger.And the second medium access of the first valve body and the second valve body due to
The opening of third valve body is so that medium is discharged, therefore there is no the active force opened upwards to spool, the first valve has been effectively ensured
The spool of body and the second valve body is pressed on valve body, realize test lead and normal end be absolutely sealed and zero leakage pressure maintaining, guarantee
Test lead and normal end can accurately reflect the real change situation of pressure difference and leakage rate.
In addition, the medium on the second medium access of the first valve body and the second valve body is discharged, therefore in pressure maintaining period
The active force for opening spool upwards is not present in first valve body and the second valve body, and therefore, inflation Effective medium area can increase,
It is made into big orifice aeration aperture, reaches big flow inflation effect, shortens inflationtime, improve volumetric efficiency.
Detailed description of the invention
It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of embodiment of the present invention
Attached drawing be briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not to be seen as
It is the restriction to range, it for those of ordinary skill in the art, without creative efforts, can be with root
Other relevant attached drawings are obtained according to these attached drawings.
Fig. 1 is schematic diagram of first valve body separately as inflation shut-off valve of the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of the zero-leakage stop valve of the embodiment of the present invention；
Fig. 3 is the structural schematic diagram of sealing element in Fig. 2；
Fig. 4 is that zero-leakage stop valve shown in Fig. 2 is in inflation working state schematic representation；
Fig. 5 is that zero-leakage stop valve shown in Fig. 2 is in exhaust work status diagram.
Icon: 100- zero-leakage stop valve；The first valve body of 110-；The second valve body of 120-；130- third valve body；111- first
Medium channel；112- second medium access；113- spool；114- valve port；115- sealing ring；116- electromagnetic control assembly；117-
Sealing element；117a- forced section；117b- extension；118- elastic element；119- school extension；200- external air source；300- pressure maintaining
Container.
Specific embodiment
To keep the purposes, technical schemes and advantages of embodiment of the present invention clearer, implement below in conjunction with the present invention
The technical solution in embodiment of the present invention is clearly and completely described in attached drawing in mode, it is clear that described reality
The mode of applying is some embodiments of the invention, rather than whole embodiments.Based on the embodiment in the present invention, ability
Domain those of ordinary skill every other embodiment obtained without creative efforts, belongs to the present invention
The range of protection.Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit below and is wanted
The scope of the present invention of protection is sought, but is merely representative of selected embodiment of the invention.Based on the embodiment in the present invention,
Every other embodiment obtained by those of ordinary skill in the art without making creative efforts belongs to this
Invent the range of protection.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise " is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of
The description present invention and simplified description, rather than the equipment of indication or suggestion meaning or element must have a particular orientation, with spy
Fixed orientation construction and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is two or more,
Unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature second feature "upper" or "lower"
It may include that the first and second features directly contact, also may include that the first and second features are not direct contacts but pass through it
Between other characterisation contact.Moreover, fisrt feature includes the first spy above the second feature " above ", " above " and " above "
Sign is right above second feature and oblique upper, or is merely representative of first feature horizontal height higher than second feature.Fisrt feature exists
Second feature " under ", " lower section " and " following " include that fisrt feature is directly below and diagonally below the second feature, or is merely representative of
First feature horizontal height is less than second feature.
Embodiment 1
Referring to Fig.1 shown in-Fig. 2, the embodiment of the present invention provides a kind of zero-leakage stop valve 100, including the first valve body 110,
Second valve body 120 and third valve body 130.
First medium access 111, second medium access 112 and spool 113, spool 113 are equipped in first valve body 110
For being connected to or disconnecting first medium access 111 and second medium access 112.First medium access 111 and second medium access
When 112 disconnection, the medium of first medium access 111 presses so that spool 113 is closed to spool 113.
In the prior art, as shown in Figure 1, using the similar common two-way electromagnetic valve of structure the first valve body 110 as gas circuit
Inflate the inflation shut-off valve of pressure maintaining, wherein first medium access 111 is located at the inlet end of valve body, is connected to external air source 200,
Second medium access 112 is located at the outlet side of valve body, is connected to pressure maintaining container 300.When inflation, spool 113 is opened, and gas enters
In pressure maintaining container 300.After the completion of inflation, valve body is cut off, spool 113 is closed, at this point, gassy in entire gas channels, the
Gas in second medium access 112 has upward active force to spool 113, as shown by the arrows in Figure 1.Therefore, first medium
There are gas-blowing phenomenons for access 111 (inlet end) and second medium access 112 (outlet side), in particular, when the blowing pressure is higher,
When inflation aperture is bigger, the active force for opening spool 113 is bigger, and when pressure maintaining is tested, the gas blowby and leakage rate of valve body are also got over
Greatly, the test of true the pressure difference variation and actual leakage amount of test lead (outlet side) and normal end (inlet end) is affected.
Based on the studies above, the embodiment of the present invention proposes above-mentioned zero-leakage stop valve 100, wherein the second valve body 120
It is same or about with the first valve body 110 with the structure of third valve body 130, it is logical to be equipped with first medium access, second medium
Road and spool.
The second medium access of first valve body 110 is connected to the second medium access of the second valve body 120, and the first valve body
110 second medium access, the second valve body 120 second medium access be connected to the first medium access of third valve body 130.
That is, 100 overall structure of zero-leakage stop valve constitutes triple valve.First valve body 110 is that the medium of zero-leakage stop valve 100 enters
End, the second valve body 120 are the media outlet end of zero-leakage stop valve 100, and third valve body 130 is Jie of zero-leakage stop valve 100
Matter outlet side.
Under use state, the first valve body 110 is identical with the movement of the second valve body 120, and acts phase with third valve body 130
Instead.That is, opening simultaneously the first valve body 110, the second valve body 120, third valve body 130 is closed, or simultaneously close off the first valve body 110
With the second valve body 120, third valve body 130 is opened.
Further, in an embodiment of the present invention, 130 one of the first valve body 110, the second valve body 120 and third valve body
Molding.First valve body 110, the second valve body 120 and third valve body 130 are set in the zero-leakage stop valve 100 of integral type, entirely
More spools and multichannel are formed in shut-off valve.
Further, in other embodiments of the invention, the first valve body 110, the second valve body 120 and third valve body 130
For split type structure, assembling forms zero-leakage stop valve 100.Can using at least three completely identical in structure common valves into
Row assembling obtains zero-leakage stop valve 100, specifically: identical two common valves of structure are reversely connected, i.e., one of valve goes out
The outlet side of gas end and another valve connects, so that the outlet side connection of two valves, the two valves are respectively as intake valve (i.e. the
One valve body 110) and pressure retaining valve (i.e. the second valve body 120) use, the inlet end of intake valve for connecting gas source, pressure retaining valve into
Enter to hold the external container for connecting air-tightness to be detected.Then accessed again on the interface channel of the two valves third valve into
Gas end is used as exhaust valve (i.e. third valve body 130).When inflation, intake valve and pressure retaining valve are opened, exhaust valve closure, gas
It is filled in external container.When carrying out pressure maintaining after the completion of inflation, intake valve and pressure retaining valve are cut off, opens exhaust valve, guarantees pressure maintaining gas
The zero leakage of body.
It should be noted that being not limited to the set-up mode of three valve bodies in other embodiments of the invention, can use more
A valve body, it is ensured that the medium in two valve body second medium channels can be effectively discharged in pressure maintaining in intake valve and pressure retaining valve
?.Such as two third valve bodies 130, a third valve are set on the interface channel of the first valve body 110 and the second valve body 120
Body 130 is connected with the second medium channel of the first valve body 110, the second medium of another third valve body 130 and the second valve body 120
Channel connection.
Further, in preferred embodiments of the present invention, first medium access 111 and second medium access 112 pass through
Valve port 114 is connected to, and spool 113, which moves, makes the bottom of spool 113 completely enclose valve port 114.The structure makes when cutting off valve body,
The lid completely of spool 113 closes valve port 114, and the medium of first medium access 111 can form downward pressure to spool 113, into one
Step forms valve port 114 and seals.
Further, sealing ring 115, sealing ring are equipped in the first valve body 110, the second valve body 120 and third valve body 130
115 weeks connecting pins set with spool 113 and valve body, are further ensured that the leakproofness of valve body.
Further, spool 113 includes electromagnetic control assembly 116, sealing element 117 and elastic element 118.Elastic element
118 between sealing element 117 and electromagnetic control assembly 116, and 116 power on/off of electromagnetic control assembly is past with band dynamic seal 117
Multiple movement, realize first medium access 111 and second medium access 112 be connected to or disconnection.In the present embodiment, elastic element
118 be preferably spring.
Further, the first valve body 110, the second valve body 120 and third valve body 130 are normal-closed electromagnetic valve.When power-off
Solenoid valve is in closed state, generates electromagnetic force when the coil is energized, makes sealing element that spring force be overcome to move upwards direct opening valve,
Medium is in access；Electromagnetic force disappears when the coil is de-energized, and sealing element resets under spring force, direct close port, is situated between
Matter is obstructed.Structure is simple, reliable in action, works normally under zero pressure difference and micro-vacuum.
Referring to Fig. 3, further, sealing element 117 includes the biggish forced section 117a of an area, and perpendicular to stress
Portion 117a and the extension 117b extended to 116 direction of electromagnetic control assembly.Forced section 117a is for sealing valve port 114, stress
The cross-sectional area of portion 117a is greater than extension 117b.When spool 113 cuts off first medium access 111 and second medium access 112
When, the medium in first medium access 111 can form better suppressing action to spool 113, further increase spool 113
Sealing effect.
Further, first medium access 111 is equipped with school extension 119, and school extension 119 is outside along the periphery of sealing element 117
It extends to form.And the bottom of school extension 119 is lower than valve port 114.The setting is enabled in the surrounding of sealing element 117 by medium
(gas, liquid) is full of, and when cutting off valve body, medium forms better seal effect to sealing element 117.
Further, the first valve body 110 and the second valve body 120 are arranged in the same horizontal line, third valve body 130 and first
Valve body 110 is arranged on the same axis.
The course of work of the zero-leakage stop valve 100 of the embodiment of the present invention is as follows:
As shown in Fig. 2, the spool of the first valve body 110, the second valve body 120 and third valve body 130 is equal under obstructed electricity condition
It is in close state.
As shown in figure 4, the first valve body 110 and the second valve body 120 are opened, and third valve body 130 is closed in gas replenishment process,
Gas in external air source 200 enters from the first medium channel of the first valve body 110, flows through the first valve body 110 and the second valve body
Then 120 second medium channel is flowed into pressure maintaining container 300 from the first medium channel of the second valve body 120.
As shown in figure 5, the first valve body 110 and the second valve body 120 are closed, and third valve body 130 is opened in pressure maintaining period, into
Row exhaust.Gas in the second medium channel of first valve body 110 and the second valve body 120 passes through the discharge of third valve body 130.The
The downward pressure of gas in the effect of spring force when the spool of one valve body 110 is by cutting valve body and its first medium channel
Power realizes being fully sealed for the first valve body 110.Same second valve body 120 by cutting valve body when spring force effect with
And its downward pressure of gas in first medium channel, realize being fully sealed for the second valve body 120.It is connected to external air source 200
Normal end and the test lead that is connected to pressure maintaining container 300 realize being absolutely sealed and zero leakage pressure maintaining for pressure maintaining gas.
The present invention also provides a kind of test device for air tightness, including gas source 200 and above-mentioned zero-leakage stop valve 100,
The first medium access of one valve body 110 is connected to gas source 200, the first medium access of the second valve body 120 and air-tightness to be detected
External equipment connection, the second medium access of third valve body 130 is connected to external atmosphere pressure.
The embodiment of the present invention also provides the control method of above-mentioned test device for air tightness, comprising the following steps:
S1 opens simultaneously the first valve body 110 and the second valve body 120, and closes third valve body 130, and medium is from the first valve body
110 first medium access flows into, and flows out in external equipment from the first medium access of the second valve body 120；
S2 simultaneously closes off the first valve body 110 and the second valve body 120, and beat after external equipment is filled with a certain amount of medium
Third valve body 130 is opened, the medium between the first valve body 110 and the second valve body 120 is discharged.
The foregoing is merely the preferred embodiment of the present invention, are not intended to restrict the invention, for this field
For technical staff, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any
Modification, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of test device for air tightness, which is characterized in that including gas source and zero-leakage stop valve, the zero-leakage stop valve packet
Include the first valve body, the second valve body and third valve body；
First valve body, second valve body and the third valve body be equipped with first medium access, second medium access with
And spool, the spool is for being connected to or disconnecting the first medium access and the second medium access, the first medium
When access and the second medium access disconnect, the medium of the first medium access presses to the spool so that the spool
It closes；
The second medium access of first valve body is connected to the second medium access of second valve body, and first valve body
Second medium access, second valve body second medium access be connected to the first medium access of the third valve body；
Under use state, first valve body is identical with the movement of second valve body, and opposite with the third valve body movement；
The first medium access of first valve body is connected to the gas source, the first medium access of second valve body with it is to be checked
The external equipment connection of air-tightness is surveyed, the second medium access of the third valve body is connected to external atmosphere pressure.
2. test device for air tightness according to claim 1, which is characterized in that first valve body, second valve body
It is split type structure with the third valve body, assembling forms the zero-leakage stop valve.
3. test device for air tightness according to claim 1, which is characterized in that first valve body, second valve body
It is integrally formed with the third valve body.
4. test device for air tightness according to claim 1, which is characterized in that the first medium access and described second
Medium channel is connected to by valve port, and the spool up and down motion makes the spool fully open or close the valve port.
5. test device for air tightness according to claim 1, which is characterized in that the spool include electromagnetic control assembly,
Sealing element and elastic element, the elastic element is between the sealing element and the electromagnetic control assembly, the electromagnetism control
Component open-closed electricity is made to drive the sealing element to move back and forth, realizes the first medium access and the second medium access
Connection disconnects.
6. test device for air tightness according to claim 5, which is characterized in that first valve body, second valve body
It is normal-closed electromagnetic valve with the third valve body.
7. test device for air tightness according to claim 5, which is characterized in that the sealing element includes that an area is biggish
Forced section, and perpendicular to the forced section and to the electromagnetic control assembly direction extend extension.
8. test device for air tightness according to claim 1, which is characterized in that first valve body and second valve body
In the same horizontal line, the third valve body and first valve body setting are on the same axis for setting.
9. a kind of control method of test device for air tightness, which is characterized in that use gas described in claim 1-8 any one
Close system safety testing device, comprising the following steps:
S1 opens simultaneously first valve body and second valve body, and closes the third valve body, and medium is from first valve
The first medium access of body flows into, and flows out in external equipment from the first medium access of second valve body；
S2 simultaneously closes off first valve body and second valve body after the external equipment is filled with a certain amount of medium, and
The third valve body is opened, the medium between first valve body and second valve body is discharged.
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| CN205155182U (en) * | 2015-11-27 | 2016-04-13 | 安徽杰克耐腐泵阀有限公司 | By dual -purpose valve of non return |
| CN106062382A (en) * | 2014-03-06 | 2016-10-26 | 费斯托股份有限两合公司 | Valve assembly |
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| CN203453497U (en) * | 2013-09-18 | 2014-02-26 | 北京星光沃特传动研究所 | Inflation valve |
| US20150136257A1 (en) * | 2013-11-15 | 2015-05-21 | Sen-Tien Shih | Control Valve Structure for a Faucet |
| CN205956463U (en) * | 2016-08-03 | 2017-02-15 | 上海册帆工业设备有限公司 | Rail train braking system's novel three -way valve |
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| CN106062382A (en) * | 2014-03-06 | 2016-10-26 | 费斯托股份有限两合公司 | Valve assembly |
| CN205155182U (en) * | 2015-11-27 | 2016-04-13 | 安徽杰克耐腐泵阀有限公司 | By dual -purpose valve of non return |
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